 package com.luke.base.util;

 /**
 * 各地图API坐标系统比较与转换; 
 * 
 * WGS84坐标系：即地球坐标系，国际上通用的坐标系。设备一般包含GPS芯片或者北斗芯片获取的经纬度为WGS84地理坐标系, 
 * 谷歌地图采用的是WGS84地理坐标系（中国范围除外）; 
 * 
 * GCJ02坐标系：即火星坐标系，是由中国国家测绘局制订的地理信息系统的坐标系统。由WGS84坐标系经加密后的坐标系。 
 * 
 * IOS地图（高德地图）、Google 地图、搜搜、阿里云、腾讯 使用 火星坐标系。
 * 
 * 谷歌中国地图和搜搜中国地图采用的是GCJ02地理坐标系; 
 * 
 * BD09坐标系：即百度坐标系，GCJ02坐标系经加密后的坐标系; 
 * 
 */ 
public class MapGPSTranslateUtil {
	public static double pi = 3.1415926535897932384626;
	public static double x_pi = 3.14159265358979324 * 3000.0 / 180.0;
	public static double a = 6378245.0;
	public static double ee = 0.00669342162296594323;


	public static double transformLat(double x, double y) {
		double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y
				+ 0.2 * Math.sqrt(Math.abs(x));
		ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
		ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
		ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
		return ret;
	}

	public static double transformLon(double x, double y) {
		double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1
				* Math.sqrt(Math.abs(x));
		ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
		ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
		ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0
				* pi)) * 2.0 / 3.0;
		return ret;
	}

	public static double[] transform(double lat, double lon) {
		if (outOfChina(lat, lon)) {
			return new double[] { lat, lon };
		}
		double dLat = transformLat(lon - 105.0, lat - 35.0);
		double dLon = transformLon(lon - 105.0, lat - 35.0);
		double radLat = lat / 180.0 * pi;
		double magic = Math.sin(radLat);
		magic = 1 - ee * magic * magic;
		double sqrtMagic = Math.sqrt(magic);
		dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
		dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
		double mgLat = lat + dLat;
		double mgLon = lon + dLon;
		return new double[] { mgLat, mgLon };
	}

	public static boolean outOfChina(double lat, double lon) {
		if (lon < 72.004 || lon > 137.8347)
			return true;
		if (lat < 0.8293 || lat > 55.8271)
			return true;
		return false;
	}

	/**
	 * 84 to 火星坐标系 (GCJ-02) World Geodetic System ==> Mars Geodetic System
	 * 
	 * @param lat
	 * @param lon
	 * @return
	 */
	public static double[] gps84_To_Gcj02(double lat, double lon) {
		if (outOfChina(lat, lon)) {
			return new double[] { lat, lon };
		}
		double dLat = transformLat(lon - 105.0, lat - 35.0);
		double dLon = transformLon(lon - 105.0, lat - 35.0);
		double radLat = lat / 180.0 * pi;
		double magic = Math.sin(radLat);
		magic = 1 - ee * magic * magic;
		double sqrtMagic = Math.sqrt(magic);
		dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
		dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
		double mgLat = lat + dLat;
		double mgLon = lon + dLon;
		return new double[] { mgLat, mgLon };
	}

	/**
	 * * 火星坐标系 (GCJ-02) to 84 * * @param lon * @param lat * @return
	 * */
	public static double[] gcj02_To_Gps84(double lat, double lon) {
		double[] gps = transform(lat, lon);
		double lontitude = lon * 2 - gps[1];
		double latitude = lat * 2 - gps[0];
		return new double[] { latitude, lontitude };
	}

	/**
	 * 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换算法 将 GCJ-02 坐标转换成 BD-09 坐标
	 * 
	 * @param lat
	 * @param lon
	 */
	public static double[] gcj02_To_Bd09(double lat, double lon) {
		double x = lon, y = lat;
		double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);
		double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);
		double tempLon = z * Math.cos(theta) + 0.0065;
		double tempLat = z * Math.sin(theta) + 0.006;
		double[] gps = { tempLat, tempLon };
		return gps;
	}


	/**
	 * * 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换算法 * * 将 BD-09 坐标转换成GCJ-02 坐标 *
	 * 
	 * @param bd_lat
	 *            *
	 * @param bd_lon
	 *            *
	 * @return
	 */
	public static double[] bd09_To_Gcj02(double lat, double lon) {
		double x = lon - 0.0065, y = lat - 0.006;
		double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
		double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
		double tempLon = z * Math.cos(theta);
		double tempLat = z * Math.sin(theta);
		double[] gps = { tempLat, tempLon };
		return gps;
	}

	/**
	 * 将gps84转为bd09
	 * 
	 * @param lat 纬度
	 * @param lon 经度
	 * @return
	 */
	public static double[] gps84_To_bd09(double lat, double lon) {
		double[] gcj02 = gps84_To_Gcj02(lat, lon);
		double[] bd09 = gcj02_To_Bd09(gcj02[0], gcj02[1]);
		bd09[0] = retain6(bd09[0]);
		bd09[1] = retain6(bd09[1]);
		
		return bd09;
	}

	public static double[] bd09_To_gps84(double lat, double lon) {
		double[] gcj02 = bd09_To_Gcj02(lat, lon);
		double[] gps84 = gcj02_To_Gps84(gcj02[0], gcj02[1]);
		// 保留小数点后六位
		gps84[0] = retain6(gps84[0]);
		gps84[1] = retain6(gps84[1]);
		return gps84;
	}

	/**
	 * 保留小数点后六位
	 * 
	 * @param num
	 * @return
	 */
	private static double retain6(double num) {
		String result = String.format("%.6f", num);
		return Double.valueOf(result);
	}

	public static void main(String[] args) {
		//火星坐标 转 百度坐标
//		 double[] arr=gcj02_To_Bd09(118.53511,36.7812);
//		 System.out.println("火星坐标 转 百度坐标 =" +arr[0]+" "+arr[1]);
		 
		 //wps-84 转百度坐标
		//double[] arr1= gps84_To_bd09(99.554008,41.906633);
		 //System.out.println("WPS84 转 百度坐标 =" +arr1[0]+" "+arr1[1]);
		double[] arr2=gps84_To_Gcj02(99.554008,41.906633);
		 System.out.println("WPS84 转火星坐标="+arr2[0]+" "+arr2[1]);
		 double[] arr3=gps84_To_Gcj02(21.480216,50.751161);
		 System.out.println("WPS84 转火星坐标="+arr3[0]+" "+arr3[1]);
	}
}
